falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45656 Commits
32 Branches
890MB
Tree: 35daf3ca81
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '35daf3ca81'
${ noResults }
FFmpeg/libswscale/utils.c

1782 lines
63KB
Raw Blame History 

  1. /*

  2.  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

  31. #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/attributes.h"

  41. #include "libavutil/avassert.h"

  42. #include "libavutil/avutil.h"

  43. #include "libavutil/bswap.h"

  44. #include "libavutil/cpu.h"

  45. #include "libavutil/intreadwrite.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/opt.h"

  48. #include "libavutil/pixdesc.h"

  49. #include "libavutil/x86/asm.h"

  50. #include "libavutil/x86/cpu.h"

  51. #include "rgb2rgb.h"

  52. #include "swscale.h"

  53. #include "swscale_internal.h"

  54. 

  55. unsigned swscale_version(void)

  56. {

  57.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  58.     return LIBSWSCALE_VERSION_INT;

  59. }

  60. 

  61. const char *swscale_configuration(void)

  62. {

  63.     return FFMPEG_CONFIGURATION;

  64. }

  65. 

  66. const char *swscale_license(void)

  67. {

  68. #define LICENSE_PREFIX "libswscale license: "

  69.     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;

  70. }

  71. 

  72. #define RET 0xC3 // near return opcode for x86

  73. 

  74. typedef struct FormatEntry {

  75.     int is_supported_in, is_supported_out;

  76. } FormatEntry;

  77. 

  78. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

  79.     [AV_PIX_FMT_YUV420P]     = { 1, 1 },

  80.     [AV_PIX_FMT_YUYV422]     = { 1, 1 },

  81.     [AV_PIX_FMT_RGB24]       = { 1, 1 },

  82.     [AV_PIX_FMT_BGR24]       = { 1, 1 },

  83.     [AV_PIX_FMT_YUV422P]     = { 1, 1 },

  84.     [AV_PIX_FMT_YUV444P]     = { 1, 1 },

  85.     [AV_PIX_FMT_YUV410P]     = { 1, 1 },

  86.     [AV_PIX_FMT_YUV411P]     = { 1, 1 },

  87.     [AV_PIX_FMT_GRAY8]       = { 1, 1 },

  88.     [AV_PIX_FMT_MONOWHITE]   = { 1, 1 },

  89.     [AV_PIX_FMT_MONOBLACK]   = { 1, 1 },

  90.     [AV_PIX_FMT_PAL8]        = { 1, 0 },

  91.     [AV_PIX_FMT_YUVJ420P]    = { 1, 1 },

  92.     [AV_PIX_FMT_YUVJ422P]    = { 1, 1 },

  93.     [AV_PIX_FMT_YUVJ444P]    = { 1, 1 },

  94.     [AV_PIX_FMT_UYVY422]     = { 1, 1 },

  95.     [AV_PIX_FMT_UYYVYY411]   = { 0, 0 },

  96.     [AV_PIX_FMT_BGR8]        = { 1, 1 },

  97.     [AV_PIX_FMT_BGR4]        = { 0, 1 },

  98.     [AV_PIX_FMT_BGR4_BYTE]   = { 1, 1 },

  99.     [AV_PIX_FMT_RGB8]        = { 1, 1 },

  100.     [AV_PIX_FMT_RGB4]        = { 0, 1 },

  101.     [AV_PIX_FMT_RGB4_BYTE]   = { 1, 1 },

  102.     [AV_PIX_FMT_NV12]        = { 1, 1 },

  103.     [AV_PIX_FMT_NV21]        = { 1, 1 },

  104.     [AV_PIX_FMT_ARGB]        = { 1, 1 },

  105.     [AV_PIX_FMT_RGBA]        = { 1, 1 },

  106.     [AV_PIX_FMT_ABGR]        = { 1, 1 },

  107.     [AV_PIX_FMT_BGRA]        = { 1, 1 },

  108.     [AV_PIX_FMT_0RGB]        = { 1, 1 },

  109.     [AV_PIX_FMT_RGB0]        = { 1, 1 },

  110.     [AV_PIX_FMT_0BGR]        = { 1, 1 },

  111.     [AV_PIX_FMT_BGR0]        = { 1, 1 },

  112.     [AV_PIX_FMT_GRAY16BE]    = { 1, 1 },

  113.     [AV_PIX_FMT_GRAY16LE]    = { 1, 1 },

  114.     [AV_PIX_FMT_YUV440P]     = { 1, 1 },

  115.     [AV_PIX_FMT_YUVJ440P]    = { 1, 1 },

  116.     [AV_PIX_FMT_YUVA420P]    = { 1, 1 },

  117.     [AV_PIX_FMT_YUVA422P]    = { 1, 1 },

  118.     [AV_PIX_FMT_YUVA444P]    = { 1, 1 },

  119.     [AV_PIX_FMT_RGB48BE]     = { 1, 1 },

  120.     [AV_PIX_FMT_RGB48LE]     = { 1, 1 },

  121.     [AV_PIX_FMT_RGBA64BE]    = { 1, 0 },

  122.     [AV_PIX_FMT_RGBA64LE]    = { 1, 0 },

  123.     [AV_PIX_FMT_RGB565BE]    = { 1, 1 },

  124.     [AV_PIX_FMT_RGB565LE]    = { 1, 1 },

  125.     [AV_PIX_FMT_RGB555BE]    = { 1, 1 },

  126.     [AV_PIX_FMT_RGB555LE]    = { 1, 1 },

  127.     [AV_PIX_FMT_BGR565BE]    = { 1, 1 },

  128.     [AV_PIX_FMT_BGR565LE]    = { 1, 1 },

  129.     [AV_PIX_FMT_BGR555BE]    = { 1, 1 },

  130.     [AV_PIX_FMT_BGR555LE]    = { 1, 1 },

  131.     [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },

  132.     [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },

  133.     [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },

  134.     [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },

  135.     [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },

  136.     [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },

  137.     [AV_PIX_FMT_RGB444LE]    = { 1, 1 },

  138.     [AV_PIX_FMT_RGB444BE]    = { 1, 1 },

  139.     [AV_PIX_FMT_BGR444LE]    = { 1, 1 },

  140.     [AV_PIX_FMT_BGR444BE]    = { 1, 1 },

  141.     [AV_PIX_FMT_Y400A]       = { 1, 0 },

  142.     [AV_PIX_FMT_BGR48BE]     = { 1, 1 },

  143.     [AV_PIX_FMT_BGR48LE]     = { 1, 1 },

  144.     [AV_PIX_FMT_BGRA64BE]    = { 0, 0 },

  145.     [AV_PIX_FMT_BGRA64LE]    = { 0, 0 },

  146.     [AV_PIX_FMT_YUV420P9BE]  = { 1, 1 },

  147.     [AV_PIX_FMT_YUV420P9LE]  = { 1, 1 },

  148.     [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },

  149.     [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },

  150.     [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },

  151.     [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },

  152.     [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },

  153.     [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },

  154.     [AV_PIX_FMT_YUV422P9BE]  = { 1, 1 },

  155.     [AV_PIX_FMT_YUV422P9LE]  = { 1, 1 },

  156.     [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },

  157.     [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },

  158.     [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },

  159.     [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },

  160.     [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },

  161.     [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },

  162.     [AV_PIX_FMT_YUV444P9BE]  = { 1, 1 },

  163.     [AV_PIX_FMT_YUV444P9LE]  = { 1, 1 },

  164.     [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },

  165.     [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },

  166.     [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },

  167.     [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },

  168.     [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },

  169.     [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },

  170.     [AV_PIX_FMT_GBRP]        = { 1, 0 },

  171.     [AV_PIX_FMT_GBRP9LE]     = { 1, 0 },

  172.     [AV_PIX_FMT_GBRP9BE]     = { 1, 0 },

  173.     [AV_PIX_FMT_GBRP10LE]    = { 1, 0 },

  174.     [AV_PIX_FMT_GBRP10BE]    = { 1, 0 },

  175.     [AV_PIX_FMT_GBRP12LE]    = { 1, 0 },

  176.     [AV_PIX_FMT_GBRP12BE]    = { 1, 0 },

  177.     [AV_PIX_FMT_GBRP14LE]    = { 1, 0 },

  178.     [AV_PIX_FMT_GBRP14BE]    = { 1, 0 },

  179.     [AV_PIX_FMT_GBRP16LE]    = { 1, 0 },

  180.     [AV_PIX_FMT_GBRP16BE]    = { 1, 0 },

  181. };

  182. 

  183. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  184. {

  185.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  186.            format_entries[pix_fmt].is_supported_in : 0;

  187. }

  188. 

  189. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  190. {

  191.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  192.            format_entries[pix_fmt].is_supported_out : 0;

  193. }

  194. 

  195. extern const int32_t ff_yuv2rgb_coeffs[8][4];

  196. 

  197. #if FF_API_SWS_FORMAT_NAME

  198. const char *sws_format_name(enum AVPixelFormat format)

  199. {

  200.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);

  201.     if (desc)

  202.         return desc->name;

  203.     else

  204.         return "Unknown format";

  205. }

  206. #endif

  207. 

  208. static double getSplineCoeff(double a, double b, double c, double d,

  209.                              double dist)

  210. {

  211.     if (dist <= 1.0)

  212.         return ((d * dist + c) * dist + b) * dist + a;

  213.     else

  214.         return getSplineCoeff(0.0,

  215.                                b + 2.0 * c + 3.0 * d,

  216.                                c + 3.0 * d,

  217.                               -b - 3.0 * c - 6.0 * d,

  218.                               dist - 1.0);

  219. }

  220. 

  221. static int initFilter(int16_t **outFilter, int32_t **filterPos,

  222.                       int *outFilterSize, int xInc, int srcW, int dstW,

  223.                       int filterAlign, int one, int flags, int cpu_flags,

  224.                       SwsVector *srcFilter, SwsVector *dstFilter,

  225.                       double param[2])

  226. {

  227.     int i;

  228.     int filterSize;

  229.     int filter2Size;

  230.     int minFilterSize;

  231.     int64_t *filter    = NULL;

  232.     int64_t *filter2   = NULL;

  233.     const int64_t fone = 1LL << 54;

  234.     int ret            = -1;

  235. 

  236.     emms_c(); // FIXME should not be required but IS (even for non-MMX versions)

  237. 

  238.     // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end

  239.     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);

  240. 

  241.     if (FFABS(xInc - 0x10000) < 10) { // unscaled

  242.         int i;

  243.         filterSize = 1;

  244.         FF_ALLOCZ_OR_GOTO(NULL, filter,

  245.                           dstW * sizeof(*filter) * filterSize, fail);

  246. 

  247.         for (i = 0; i < dstW; i++) {

  248.             filter[i * filterSize] = fone;

  249.             (*filterPos)[i]        = i;

  250.         }

  251.     } else if (flags & SWS_POINT) { // lame looking point sampling mode

  252.         int i;

  253.         int64_t xDstInSrc;

  254.         filterSize = 1;

  255.         FF_ALLOC_OR_GOTO(NULL, filter,

  256.                          dstW * sizeof(*filter) * filterSize, fail);

  257. 

  258.         xDstInSrc = xInc / 2 - 0x8000;

  259.         for (i = 0; i < dstW; i++) {

  260.             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

  261. 

  262.             (*filterPos)[i] = xx;

  263.             filter[i]       = fone;

  264.             xDstInSrc      += xInc;

  265.         }

  266.     } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||

  267.                (flags & SWS_FAST_BILINEAR)) { // bilinear upscale

  268.         int i;

  269.         int64_t xDstInSrc;

  270.         filterSize = 2;

  271.         FF_ALLOC_OR_GOTO(NULL, filter,

  272.                          dstW * sizeof(*filter) * filterSize, fail);

  273. 

  274.         xDstInSrc = xInc / 2 - 0x8000;

  275.         for (i = 0; i < dstW; i++) {

  276.             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

  277.             int j;

  278. 

  279.             (*filterPos)[i] = xx;

  280.             // bilinear upscale / linear interpolate / area averaging

  281.             for (j = 0; j < filterSize; j++) {

  282.                 int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);

  283.                 if (coeff < 0)

  284.                     coeff = 0;

  285.                 filter[i * filterSize + j] = coeff;

  286.                 xx++;

  287.             }

  288.             xDstInSrc += xInc;

  289.         }

  290.     } else {

  291.         int64_t xDstInSrc;

  292.         int sizeFactor;

  293. 

  294.         if (flags & SWS_BICUBIC)

  295.             sizeFactor = 4;

  296.         else if (flags & SWS_X)

  297.             sizeFactor = 8;

  298.         else if (flags & SWS_AREA)

  299.             sizeFactor = 1;     // downscale only, for upscale it is bilinear

  300.         else if (flags & SWS_GAUSS)

  301.             sizeFactor = 8;     // infinite ;)

  302.         else if (flags & SWS_LANCZOS)

  303.             sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;

  304.         else if (flags & SWS_SINC)

  305.             sizeFactor = 20;    // infinite ;)

  306.         else if (flags & SWS_SPLINE)

  307.             sizeFactor = 20;    // infinite ;)

  308.         else if (flags & SWS_BILINEAR)

  309.             sizeFactor = 2;

  310.         else {

  311.             av_assert0(0);

  312.         }

  313. 

  314.         if (xInc <= 1 << 16)

  315.             filterSize = 1 + sizeFactor;    // upscale

  316.         else

  317.             filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;

  318. 

  319.         filterSize = FFMIN(filterSize, srcW - 2);

  320.         filterSize = FFMAX(filterSize, 1);

  321. 

  322.         FF_ALLOC_OR_GOTO(NULL, filter,

  323.                          dstW * sizeof(*filter) * filterSize, fail);

  324. 

  325.         xDstInSrc = xInc - 0x10000;

  326.         for (i = 0; i < dstW; i++) {

  327.             int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);

  328.             int j;

  329.             (*filterPos)[i] = xx;

  330.             for (j = 0; j < filterSize; j++) {

  331.                 int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;

  332.                 double floatd;

  333.                 int64_t coeff;

  334. 

  335.                 if (xInc > 1 << 16)

  336.                     d = d * dstW / srcW;

  337.                 floatd = d * (1.0 / (1 << 30));

  338. 

  339.                 if (flags & SWS_BICUBIC) {

  340.                     int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] :   0) * (1 << 24);

  341.                     int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);

  342. 

  343.                     if (d >= 1LL << 31) {

  344.                         coeff = 0.0;

  345.                     } else {

  346.                         int64_t dd  = (d  * d) >> 30;

  347.                         int64_t ddd = (dd * d) >> 30;

  348. 

  349.                         if (d < 1LL << 30)

  350.                             coeff =  (12 * (1 << 24) -  9 * B - 6 * C) * ddd +

  351.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  352.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  353.                         else

  354.                             coeff =      (-B -  6 * C) * ddd +

  355.                                       (6 * B + 30 * C) * dd  +

  356.                                     (-12 * B - 48 * C) * d   +

  357.                                       (8 * B + 24 * C) * (1 << 30);

  358.                     }

  359.                     coeff *= fone >> (30 + 24);

  360.                 }

  361. #if 0

  362.                 else if (flags & SWS_X) {

  363.                     double p  = param ? param * 0.01 : 0.3;

  364.                     coeff     = d ? sin(d * M_PI) / (d * M_PI) : 1.0;

  365.                     coeff    *= pow(2.0, -p * d * d);

  366.                 }

  367. #endif

  368.                 else if (flags & SWS_X) {

  369.                     double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;

  370.                     double c;

  371. 

  372.                     if (floatd < 1.0)

  373.                         c = cos(floatd * M_PI);

  374.                     else

  375.                         c = -1.0;

  376.                     if (c < 0.0)

  377.                         c = -pow(-c, A);

  378.                     else

  379.                         c = pow(c, A);

  380.                     coeff = (c * 0.5 + 0.5) * fone;

  381.                 } else if (flags & SWS_AREA) {

  382.                     int64_t d2 = d - (1 << 29);

  383.                     if (d2 * xInc < -(1LL << (29 + 16)))

  384.                         coeff = 1.0 * (1LL << (30 + 16));

  385.                     else if (d2 * xInc < (1LL << (29 + 16)))

  386.                         coeff = -d2 * xInc + (1LL << (29 + 16));

  387.                     else

  388.                         coeff = 0.0;

  389.                     coeff *= fone >> (30 + 16);

  390.                 } else if (flags & SWS_GAUSS) {

  391.                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  392.                     coeff = (pow(2.0, -p * floatd * floatd)) * fone;

  393.                 } else if (flags & SWS_SINC) {

  394.                     coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;

  395.                 } else if (flags & SWS_LANCZOS) {

  396.                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  397.                     coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /

  398.                              (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;

  399.                     if (floatd > p)

  400.                         coeff = 0;

  401.                 } else if (flags & SWS_BILINEAR) {

  402.                     coeff = (1 << 30) - d;

  403.                     if (coeff < 0)

  404.                         coeff = 0;

  405.                     coeff *= fone >> 30;

  406.                 } else if (flags & SWS_SPLINE) {

  407.                     double p = -2.196152422706632;

  408.                     coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;

  409.                 } else {

  410.                     av_assert0(0);

  411.                 }

  412. 

  413.                 filter[i * filterSize + j] = coeff;

  414.                 xx++;

  415.             }

  416.             xDstInSrc += 2 * xInc;

  417.         }

  418.     }

  419. 

  420.     /* apply src & dst Filter to filter -> filter2

  421.      * av_free(filter);

  422.      */

  423.     av_assert0(filterSize > 0);

  424.     filter2Size = filterSize;

  425.     if (srcFilter)

  426.         filter2Size += srcFilter->length - 1;

  427.     if (dstFilter)

  428.         filter2Size += dstFilter->length - 1;

  429.     av_assert0(filter2Size > 0);

  430.     FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);

  431. 

  432.     for (i = 0; i < dstW; i++) {

  433.         int j, k;

  434. 

  435.         if (srcFilter) {

  436.             for (k = 0; k < srcFilter->length; k++) {

  437.                 for (j = 0; j < filterSize; j++)

  438.                     filter2[i * filter2Size + k + j] +=

  439.                         srcFilter->coeff[k] * filter[i * filterSize + j];

  440.             }

  441.         } else {

  442.             for (j = 0; j < filterSize; j++)

  443.                 filter2[i * filter2Size + j] = filter[i * filterSize + j];

  444.         }

  445.         // FIXME dstFilter

  446. 

  447.         (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;

  448.     }

  449.     av_freep(&filter);

  450. 

  451.     /* try to reduce the filter-size (step1 find size and shift left) */

  452.     // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).

  453.     minFilterSize = 0;

  454.     for (i = dstW - 1; i >= 0; i--) {

  455.         int min = filter2Size;

  456.         int j;

  457.         int64_t cutOff = 0.0;

  458. 

  459.         /* get rid of near zero elements on the left by shifting left */

  460.         for (j = 0; j < filter2Size; j++) {

  461.             int k;

  462.             cutOff += FFABS(filter2[i * filter2Size]);

  463. 

  464.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  465.                 break;

  466. 

  467.             /* preserve monotonicity because the core can't handle the

  468.              * filter otherwise */

  469.             if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])

  470.                 break;

  471. 

  472.             // move filter coefficients left

  473.             for (k = 1; k < filter2Size; k++)

  474.                 filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];

  475.             filter2[i * filter2Size + k - 1] = 0;

  476.             (*filterPos)[i]++;

  477.         }

  478. 

  479.         cutOff = 0;

  480.         /* count near zeros on the right */

  481.         for (j = filter2Size - 1; j > 0; j--) {

  482.             cutOff += FFABS(filter2[i * filter2Size + j]);

  483. 

  484.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  485.                 break;

  486.             min--;

  487.         }

  488. 

  489.         if (min > minFilterSize)

  490.             minFilterSize = min;

  491.     }

  492. 

  493.     if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) {

  494.         // we can handle the special case 4, so we don't want to go the full 8

  495.         if (minFilterSize < 5)

  496.             filterAlign = 4;

  497. 

  498.         /* We really don't want to waste our time doing useless computation, so

  499.          * fall back on the scalar C code for very small filters.

  500.          * Vectorizing is worth it only if you have a decent-sized vector. */

  501.         if (minFilterSize < 3)

  502.             filterAlign = 1;

  503.     }

  504. 

  505.     if (INLINE_MMX(cpu_flags)) {

  506.         // special case for unscaled vertical filtering

  507.         if (minFilterSize == 1 && filterAlign == 2)

  508.             filterAlign = 1;

  509.     }

  510. 

  511.     av_assert0(minFilterSize > 0);

  512.     filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));

  513.     av_assert0(filterSize > 0);

  514.     filter = av_malloc(filterSize * dstW * sizeof(*filter));

  515.     if (filterSize >= MAX_FILTER_SIZE * 16 /

  516.                       ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter)

  517.         goto fail;

  518.     *outFilterSize = filterSize;

  519. 

  520.     if (flags & SWS_PRINT_INFO)

  521.         av_log(NULL, AV_LOG_VERBOSE,

  522.                "SwScaler: reducing / aligning filtersize %d -> %d\n",

  523.                filter2Size, filterSize);

  524.     /* try to reduce the filter-size (step2 reduce it) */

  525.     for (i = 0; i < dstW; i++) {

  526.         int j;

  527. 

  528.         for (j = 0; j < filterSize; j++) {

  529.             if (j >= filter2Size)

  530.                 filter[i * filterSize + j] = 0;

  531.             else

  532.                 filter[i * filterSize + j] = filter2[i * filter2Size + j];

  533.             if ((flags & SWS_BITEXACT) && j >= minFilterSize)

  534.                 filter[i * filterSize + j] = 0;

  535.         }

  536.     }

  537. 

  538.     // FIXME try to align filterPos if possible

  539. 

  540.     // fix borders

  541.     for (i = 0; i < dstW; i++) {

  542.         int j;

  543.         if ((*filterPos)[i] < 0) {

  544.             // move filter coefficients left to compensate for filterPos

  545.             for (j = 1; j < filterSize; j++) {

  546.                 int left = FFMAX(j + (*filterPos)[i], 0);

  547.                 filter[i * filterSize + left] += filter[i * filterSize + j];

  548.                 filter[i * filterSize + j]     = 0;

  549.             }

  550.             (*filterPos)[i]= 0;

  551.         }

  552. 

  553.         if ((*filterPos)[i] + filterSize > srcW) {

  554.             int shift = (*filterPos)[i] + filterSize - srcW;

  555.             // move filter coefficients right to compensate for filterPos

  556.             for (j = filterSize - 2; j >= 0; j--) {

  557.                 int right = FFMIN(j + shift, filterSize - 1);

  558.                 filter[i * filterSize + right] += filter[i * filterSize + j];

  559.                 filter[i * filterSize + j]      = 0;

  560.             }

  561.             (*filterPos)[i]= srcW - filterSize;

  562.         }

  563.     }

  564. 

  565.     // Note the +1 is for the MMX scaler which reads over the end

  566.     /* align at 16 for AltiVec (needed by hScale_altivec_real) */

  567.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

  568.                       *outFilterSize * (dstW + 3) * sizeof(int16_t), fail);

  569. 

  570.     /* normalize & store in outFilter */

  571.     for (i = 0; i < dstW; i++) {

  572.         int j;

  573.         int64_t error = 0;

  574.         int64_t sum   = 0;

  575. 

  576.         for (j = 0; j < filterSize; j++) {

  577.             sum += filter[i * filterSize + j];

  578.         }

  579.         sum = (sum + one / 2) / one;

  580.         for (j = 0; j < *outFilterSize; j++) {

  581.             int64_t v = filter[i * filterSize + j] + error;

  582.             int intV  = ROUNDED_DIV(v, sum);

  583.             (*outFilter)[i * (*outFilterSize) + j] = intV;

  584.             error                                  = v - intV * sum;

  585.         }

  586.     }

  587. 

  588.     (*filterPos)[dstW + 0] =

  589.     (*filterPos)[dstW + 1] =

  590.     (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will

  591.                                                       * read over the end */

  592.     for (i = 0; i < *outFilterSize; i++) {

  593.         int k = (dstW - 1) * (*outFilterSize) + i;

  594.         (*outFilter)[k + 1 * (*outFilterSize)] =

  595.         (*outFilter)[k + 2 * (*outFilterSize)] =

  596.         (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];

  597.     }

  598. 

  599.     ret = 0;

  600. 

  601. fail:

  602.     av_free(filter);

  603.     av_free(filter2);

  604.     return ret;

  605. }

  606. 

  607. #if HAVE_MMXEXT_INLINE

  608. static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode,

  609.                            int16_t *filter, int32_t *filterPos, int numSplits)

  610. {

  611.     uint8_t *fragmentA;

  612.     x86_reg imm8OfPShufW1A;

  613.     x86_reg imm8OfPShufW2A;

  614.     x86_reg fragmentLengthA;

  615.     uint8_t *fragmentB;

  616.     x86_reg imm8OfPShufW1B;

  617.     x86_reg imm8OfPShufW2B;

  618.     x86_reg fragmentLengthB;

  619.     int fragmentPos;

  620. 

  621.     int xpos, i;

  622. 

  623.     // create an optimized horizontal scaling routine

  624.     /* This scaler is made of runtime-generated MMX2 code using specially tuned

  625.      * pshufw instructions. For every four output pixels, if four input pixels

  626.      * are enough for the fast bilinear scaling, then a chunk of fragmentB is

  627.      * used. If five input pixels are needed, then a chunk of fragmentA is used.

  628.      */

  629. 

  630.     // code fragment

  631. 

  632.     __asm__ volatile (

  633.         "jmp                         9f                 \n\t"

  634.         // Begin

  635.         "0:                                             \n\t"

  636.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  637.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  638.         "movd   1(%%"REG_c", %%"REG_S"), %%mm1          \n\t"

  639.         "punpcklbw                %%mm7, %%mm1          \n\t"

  640.         "punpcklbw                %%mm7, %%mm0          \n\t"

  641.         "pshufw                   $0xFF, %%mm1, %%mm1   \n\t"

  642.         "1:                                             \n\t"

  643.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  644.         "2:                                             \n\t"

  645.         "psubw                    %%mm1, %%mm0          \n\t"

  646.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  647.         "pmullw                   %%mm3, %%mm0          \n\t"

  648.         "psllw                       $7, %%mm1          \n\t"

  649.         "paddw                    %%mm1, %%mm0          \n\t"

  650. 

  651.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  652. 

  653.         "add                         $8, %%"REG_a"      \n\t"

  654.         // End

  655.         "9:                                             \n\t"

  656.         // "int $3                                         \n\t"

  657.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  658.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  659.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  660.         "dec                         %1                 \n\t"

  661.         "dec                         %2                 \n\t"

  662.         "sub                         %0, %1             \n\t"

  663.         "sub                         %0, %2             \n\t"

  664.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  665.         "sub                         %0, %3             \n\t"

  666. 

  667. 

  668.         : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),

  669.           "=r" (fragmentLengthA)

  670.         );

  671. 

  672.     __asm__ volatile (

  673.         "jmp                         9f                 \n\t"

  674.         // Begin

  675.         "0:                                             \n\t"

  676.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  677.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  678.         "punpcklbw                %%mm7, %%mm0          \n\t"

  679.         "pshufw                   $0xFF, %%mm0, %%mm1   \n\t"

  680.         "1:                                             \n\t"

  681.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  682.         "2:                                             \n\t"

  683.         "psubw                    %%mm1, %%mm0          \n\t"

  684.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  685.         "pmullw                   %%mm3, %%mm0          \n\t"

  686.         "psllw                       $7, %%mm1          \n\t"

  687.         "paddw                    %%mm1, %%mm0          \n\t"

  688. 

  689.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  690. 

  691.         "add                         $8, %%"REG_a"      \n\t"

  692.         // End

  693.         "9:                                             \n\t"

  694.         // "int                       $3                   \n\t"

  695.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  696.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  697.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  698.         "dec                         %1                 \n\t"

  699.         "dec                         %2                 \n\t"

  700.         "sub                         %0, %1             \n\t"

  701.         "sub                         %0, %2             \n\t"

  702.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  703.         "sub                         %0, %3             \n\t"

  704. 

  705. 

  706.         : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),

  707.           "=r" (fragmentLengthB)

  708.         );

  709. 

  710.     xpos        = 0; // lumXInc/2 - 0x8000; // difference between pixel centers

  711.     fragmentPos = 0;

  712. 

  713.     for (i = 0; i < dstW / numSplits; i++) {

  714.         int xx = xpos >> 16;

  715. 

  716.         if ((i & 3) == 0) {

  717.             int a                  = 0;

  718.             int b                  = ((xpos + xInc) >> 16) - xx;

  719.             int c                  = ((xpos + xInc * 2) >> 16) - xx;

  720.             int d                  = ((xpos + xInc * 3) >> 16) - xx;

  721.             int inc                = (d + 1 < 4);

  722.             uint8_t *fragment      = (d + 1 < 4) ? fragmentB : fragmentA;

  723.             x86_reg imm8OfPShufW1  = (d + 1 < 4) ? imm8OfPShufW1B : imm8OfPShufW1A;

  724.             x86_reg imm8OfPShufW2  = (d + 1 < 4) ? imm8OfPShufW2B : imm8OfPShufW2A;

  725.             x86_reg fragmentLength = (d + 1 < 4) ? fragmentLengthB : fragmentLengthA;

  726.             int maxShift           = 3 - (d + inc);

  727.             int shift              = 0;

  728. 

  729.             if (filterCode) {

  730.                 filter[i]        = ((xpos              & 0xFFFF) ^ 0xFFFF) >> 9;

  731.                 filter[i + 1]    = (((xpos + xInc)     & 0xFFFF) ^ 0xFFFF) >> 9;

  732.                 filter[i + 2]    = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;

  733.                 filter[i + 3]    = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;

  734.                 filterPos[i / 2] = xx;

  735. 

  736.                 memcpy(filterCode + fragmentPos, fragment, fragmentLength);

  737. 

  738.                 filterCode[fragmentPos + imm8OfPShufW1] =  (a + inc)       |

  739.                                                           ((b + inc) << 2) |

  740.                                                           ((c + inc) << 4) |

  741.                                                           ((d + inc) << 6);

  742.                 filterCode[fragmentPos + imm8OfPShufW2] =  a | (b << 2) |

  743.                                                                (c << 4) |

  744.                                                                (d << 6);

  745. 

  746.                 if (i + 4 - inc >= dstW)

  747.                     shift = maxShift;               // avoid overread

  748.                 else if ((filterPos[i / 2] & 3) <= maxShift)

  749.                     shift = filterPos[i / 2] & 3;   // align

  750. 

  751.                 if (shift && i >= shift) {

  752.                     filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;

  753.                     filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;

  754.                     filterPos[i / 2]                        -= shift;

  755.                 }

  756.             }

  757. 

  758.             fragmentPos += fragmentLength;

  759. 

  760.             if (filterCode)

  761.                 filterCode[fragmentPos] = RET;

  762.         }

  763.         xpos += xInc;

  764.     }

  765.     if (filterCode)

  766.         filterPos[((i / 2) + 1) & (~1)] = xpos >> 16;  // needed to jump to the next part

  767. 

  768.     return fragmentPos + 1;

  769. }

  770. #endif /* HAVE_MMXEXT_INLINE */

  771. 

  772. static void getSubSampleFactors(int *h, int *v, enum AVPixelFormat format)

  773. {

  774.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);

  775.     *h = desc->log2_chroma_w;

  776.     *v = desc->log2_chroma_h;

  777. }

  778. 

  779. int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],

  780.                              int srcRange, const int table[4], int dstRange,

  781.                              int brightness, int contrast, int saturation)

  782. {

  783.     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(c->dstFormat);

  784.     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(c->srcFormat);

  785.     memcpy(c->srcColorspaceTable, inv_table, sizeof(int) * 4);

  786.     memcpy(c->dstColorspaceTable, table, sizeof(int) * 4);

  787. 

  788.     c->brightness = brightness;

  789.     c->contrast   = contrast;

  790.     c->saturation = saturation;

  791.     c->srcRange   = srcRange;

  792.     c->dstRange   = dstRange;

  793.     if (isYUV(c->dstFormat) || isGray(c->dstFormat))

  794.         return -1;

  795. 

  796.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  797.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  798. 

  799.     ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,

  800.                              contrast, saturation);

  801.     // FIXME factorize

  802. 

  803.     if (HAVE_ALTIVEC && av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC)

  804.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  805.                                        contrast, saturation);

  806.     return 0;

  807. }

  808. 

  809. int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,

  810.                              int *srcRange, int **table, int *dstRange,

  811.                              int *brightness, int *contrast, int *saturation)

  812. {

  813.     if (!c || isYUV(c->dstFormat) || isGray(c->dstFormat))

  814.         return -1;

  815. 

  816.     *inv_table  = c->srcColorspaceTable;

  817.     *table      = c->dstColorspaceTable;

  818.     *srcRange   = c->srcRange;

  819.     *dstRange   = c->dstRange;

  820.     *brightness = c->brightness;

  821.     *contrast   = c->contrast;

  822.     *saturation = c->saturation;

  823. 

  824.     return 0;

  825. }

  826. 

  827. static int handle_jpeg(enum AVPixelFormat *format)

  828. {

  829.     switch (*format) {

  830.     case AV_PIX_FMT_YUVJ420P:

  831.         *format = AV_PIX_FMT_YUV420P;

  832.         return 1;

  833.     case AV_PIX_FMT_YUVJ422P:

  834.         *format = AV_PIX_FMT_YUV422P;

  835.         return 1;

  836.     case AV_PIX_FMT_YUVJ444P:

  837.         *format = AV_PIX_FMT_YUV444P;

  838.         return 1;

  839.     case AV_PIX_FMT_YUVJ440P:

  840.         *format = AV_PIX_FMT_YUV440P;

  841.         return 1;

  842.     default:

  843.         return 0;

  844.     }

  845. }

  846. 

  847. static int handle_0alpha(enum AVPixelFormat *format)

  848. {

  849.     switch (*format) {

  850.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  851.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  852.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  853.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  854.     default:                                          return 0;

  855.     }

  856. }

  857. 

  858. SwsContext *sws_alloc_context(void)

  859. {

  860.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  861. 

  862.     c->av_class = &sws_context_class;

  863.     av_opt_set_defaults(c);

  864. 

  865.     return c;

  866. }

  867. 

  868. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  869.                              SwsFilter *dstFilter)

  870. {

  871.     int i, j;

  872.     int usesVFilter, usesHFilter;

  873.     int unscaled;

  874.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  875.     int srcW              = c->srcW;

  876.     int srcH              = c->srcH;

  877.     int dstW              = c->dstW;

  878.     int dstH              = c->dstH;

  879.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  880.     int flags, cpu_flags;

  881.     enum AVPixelFormat srcFormat = c->srcFormat;

  882.     enum AVPixelFormat dstFormat = c->dstFormat;

  883.     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(srcFormat);

  884.     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(dstFormat);

  885. 

  886.     cpu_flags = av_get_cpu_flags();

  887.     flags     = c->flags;

  888.     emms_c();

  889.     if (!rgb15to16)

  890.         sws_rgb2rgb_init();

  891. 

  892.     unscaled = (srcW == dstW && srcH == dstH);

  893. 

  894.     handle_jpeg(&srcFormat);

  895.     handle_jpeg(&dstFormat);

  896.     handle_0alpha(&srcFormat);

  897.     handle_0alpha(&dstFormat);

  898. 

  899.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat){

  900.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  901.         c->srcFormat= srcFormat;

  902.         c->dstFormat= dstFormat;

  903.     }

  904. 

  905.     if (!sws_isSupportedInput(srcFormat)) {

  906.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  907.                av_get_pix_fmt_name(srcFormat));

  908.         return AVERROR(EINVAL);

  909.     }

  910.     if (!sws_isSupportedOutput(dstFormat)) {

  911.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  912.                av_get_pix_fmt_name(dstFormat));

  913.         return AVERROR(EINVAL);

  914.     }

  915. 

  916.     i = flags & (SWS_POINT         |

  917.                  SWS_AREA          |

  918.                  SWS_BILINEAR      |

  919.                  SWS_FAST_BILINEAR |

  920.                  SWS_BICUBIC       |

  921.                  SWS_X             |

  922.                  SWS_GAUSS         |

  923.                  SWS_LANCZOS       |

  924.                  SWS_SINC          |

  925.                  SWS_SPLINE        |

  926.                  SWS_BICUBLIN);

  927.     if (!i || (i & (i - 1))) {

  928.         av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen, got %X\n", i);

  929.         return AVERROR(EINVAL);

  930.     }

  931.     /* sanity check */

  932.     if (srcW < 4 || srcH < 1 || dstW < 8 || dstH < 1) {

  933.         /* FIXME check if these are enough and try to lower them after

  934.          * fixing the relevant parts of the code */

  935.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  936.                srcW, srcH, dstW, dstH);

  937.         return AVERROR(EINVAL);

  938.     }

  939. 

  940.     if (!dstFilter)

  941.         dstFilter = &dummyFilter;

  942.     if (!srcFilter)

  943.         srcFilter = &dummyFilter;

  944. 

  945.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  946.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  947.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  948.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  949.     c->vRounder     = 4 * 0x0001000100010001ULL;

  950. 

  951.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  952.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  953.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  954.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  955.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  956.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  957.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  958.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  959. 

  960.     getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);

  961.     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);

  962. 

  963. 

  964.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  965.         if (dstW&1) {

  966.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  967.             flags |= SWS_FULL_CHR_H_INT;

  968.             c->flags = flags;

  969.         }

  970.     }

  971.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  972.      * chroma interpolation */

  973.     if (flags & SWS_FULL_CHR_H_INT &&

  974.         isAnyRGB(dstFormat)        &&

  975.         dstFormat != AV_PIX_FMT_RGBA  &&

  976.         dstFormat != AV_PIX_FMT_ARGB  &&

  977.         dstFormat != AV_PIX_FMT_BGRA  &&

  978.         dstFormat != AV_PIX_FMT_ABGR  &&

  979.         dstFormat != AV_PIX_FMT_RGB24 &&

  980.         dstFormat != AV_PIX_FMT_BGR24) {

  981.         av_log(c, AV_LOG_WARNING,

  982.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  983.                av_get_pix_fmt_name(dstFormat));

  984.         flags   &= ~SWS_FULL_CHR_H_INT;

  985.         c->flags = flags;

  986.     }

  987.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  988.         c->chrDstHSubSample = 1;

  989. 

  990.     // drop some chroma lines if the user wants it

  991.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  992.                            SWS_SRC_V_CHR_DROP_SHIFT;

  993.     c->chrSrcVSubSample += c->vChrDrop;

  994. 

  995.     /* drop every other pixel for chroma calculation unless user

  996.      * wants full chroma */

  997.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  998.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  999.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1000.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1001.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1002.          (flags & SWS_FAST_BILINEAR)))

  1003.         c->chrSrcHSubSample = 1;

  1004. 

  1005.     // Note the -((-x)>>y) is so that we always round toward +inf.

  1006.     c->chrSrcW = -((-srcW) >> c->chrSrcHSubSample);

  1007.     c->chrSrcH = -((-srcH) >> c->chrSrcVSubSample);

  1008.     c->chrDstW = -((-dstW) >> c->chrDstHSubSample);

  1009.     c->chrDstH = -((-dstH) >> c->chrDstVSubSample);

  1010. 

  1011.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1012. 

  1013.     /* unscaled special cases */

  1014.     if (unscaled && !usesHFilter && !usesVFilter &&

  1015.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1016.         ff_get_unscaled_swscale(c);

  1017. 

  1018.         if (c->swScale) {

  1019.             if (flags & SWS_PRINT_INFO)

  1020.                 av_log(c, AV_LOG_INFO,

  1021.                        "using unscaled %s -> %s special converter\n",

  1022.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1023.             return 0;

  1024.         }

  1025.     }

  1026. 

  1027.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1028.     if (c->srcBpc < 8)

  1029.         c->srcBpc = 8;

  1030.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1031.     if (c->dstBpc < 8)

  1032.         c->dstBpc = 8;

  1033.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1034.         c->srcBpc = 16;

  1035.     if (c->dstBpc == 16)

  1036.         dst_stride <<= 1;

  1037.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1038.         c->canMMX2BeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1039.                             (srcW & 15) == 0) ? 1 : 0;

  1040.         if (!c->canMMX2BeUsed && dstW >= srcW && (srcW & 15) == 0

  1041.             && (flags & SWS_FAST_BILINEAR)) {

  1042.             if (flags & SWS_PRINT_INFO)

  1043.                 av_log(c, AV_LOG_INFO,

  1044.                        "output width is not a multiple of 32 -> no MMX2 scaler\n");

  1045.         }

  1046.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1047.             c->canMMX2BeUsed=0;

  1048.     } else

  1049.         c->canMMX2BeUsed = 0;

  1050. 

  1051.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1052.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1053. 

  1054.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1055.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1056.      * correct scaling.

  1057.      * n-2 is the last chrominance sample available.

  1058.      * This is not perfect, but no one should notice the difference, the more

  1059.      * correct variant would be like the vertical one, but that would require

  1060.      * some special code for the first and last pixel */

  1061.     if (flags & SWS_FAST_BILINEAR) {

  1062.         if (c->canMMX2BeUsed) {

  1063.             c->lumXInc += 20;

  1064.             c->chrXInc += 20;

  1065.         }

  1066.         // we don't use the x86 asm scaler if MMX is available

  1067.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1068.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1069.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1070.         }

  1071.     }

  1072. 

  1073. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1074. 

  1075.     /* precalculate horizontal scaler filter coefficients */

  1076.     {

  1077. #if HAVE_MMXEXT_INLINE

  1078. // can't downscale !!!

  1079.         if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) {

  1080.             c->lumMmx2FilterCodeSize = initMMX2HScaler(dstW, c->lumXInc, NULL,

  1081.                                                        NULL, NULL, 8);

  1082.             c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc,

  1083.                                                        NULL, NULL, NULL, 4);

  1084. 

  1085. #if USE_MMAP

  1086.             c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1087.             c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1088. #elif HAVE_VIRTUALALLOC

  1089.             c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1090.             c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1091. #else

  1092.             c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize);

  1093.             c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize);

  1094. #endif

  1095. 

  1096. #ifdef MAP_ANONYMOUS

  1097.             if (c->lumMmx2FilterCode == MAP_FAILED || c->chrMmx2FilterCode == MAP_FAILED)

  1098. #else

  1099.             if (!c->lumMmx2FilterCode || !c->chrMmx2FilterCode)

  1100. #endif

  1101.             {

  1102.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1103.                 return AVERROR(ENOMEM);

  1104.             }

  1105. 

  1106.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1107.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1108.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1109.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1110. 

  1111.             initMMX2HScaler(      dstW, c->lumXInc, c->lumMmx2FilterCode,

  1112.                             c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1113.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode,

  1114.                             c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1115. 

  1116. #if USE_MMAP

  1117.             mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1118.             mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1119. #endif

  1120.         } else

  1121. #endif /* HAVE_MMXEXT_INLINE */

  1122.         {

  1123.             const int filterAlign =

  1124.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1125.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1126.                 1;

  1127. 

  1128.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1129.                            &c->hLumFilterSize, c->lumXInc,

  1130.                            srcW, dstW, filterAlign, 1 << 14,

  1131.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1132.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1133.                            c->param) < 0)

  1134.                 goto fail;

  1135.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1136.                            &c->hChrFilterSize, c->chrXInc,

  1137.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1138.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1139.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1140.                            c->param) < 0)

  1141.                 goto fail;

  1142.         }

  1143.     } // initialize horizontal stuff

  1144. 

  1145.     /* precalculate vertical scaler filter coefficients */

  1146.     {

  1147.         const int filterAlign =

  1148.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1149.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1150.             1;

  1151. 

  1152.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1153.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1154.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1155.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1156.                        c->param) < 0)

  1157.             goto fail;

  1158.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1159.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1160.                        filterAlign, (1 << 12),

  1161.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1162.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1163.                        c->param) < 0)

  1164.             goto fail;

  1165. 

  1166. #if HAVE_ALTIVEC

  1167.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1168.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1169. 

  1170.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1171.             int j;

  1172.             short *p = (short *)&c->vYCoeffsBank[i];

  1173.             for (j = 0; j < 8; j++)

  1174.                 p[j] = c->vLumFilter[i];

  1175.         }

  1176. 

  1177.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1178.             int j;

  1179.             short *p = (short *)&c->vCCoeffsBank[i];

  1180.             for (j = 0; j < 8; j++)

  1181.                 p[j] = c->vChrFilter[i];

  1182.         }

  1183. #endif

  1184.     }

  1185. 

  1186.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1187.     c->vLumBufSize = c->vLumFilterSize;

  1188.     c->vChrBufSize = c->vChrFilterSize;

  1189.     for (i = 0; i < dstH; i++) {

  1190.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1191.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1192.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1193.                                << c->chrSrcVSubSample));

  1194. 

  1195.         nextSlice >>= c->chrSrcVSubSample;

  1196.         nextSlice <<= c->chrSrcVSubSample;

  1197.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1198.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1199.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1200.             (nextSlice >> c->chrSrcVSubSample))

  1201.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1202.                              c->vChrFilterPos[chrI];

  1203.     }

  1204. 

  1205.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1206.      * need to allocate several megabytes to handle all possible cases) */

  1207.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1208.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1209.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1210.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1211.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1212.     /* Note we need at least one pixel more at the end because of the MMX code

  1213.      * (just in case someone wants to replace the 4000/8000). */

  1214.     /* align at 16 bytes for AltiVec */

  1215.     for (i = 0; i < c->vLumBufSize; i++) {

  1216.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1217.                           dst_stride + 16, fail);

  1218.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1219.     }

  1220.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1221.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1222.     c->uv_offx2 = dst_stride + 16;

  1223.     for (i = 0; i < c->vChrBufSize; i++) {

  1224.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1225.                          dst_stride * 2 + 32, fail);

  1226.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1227.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1228.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1229.     }

  1230.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1231.         for (i = 0; i < c->vLumBufSize; i++) {

  1232.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1233.                               dst_stride + 16, fail);

  1234.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1235.         }

  1236. 

  1237.     // try to avoid drawing green stuff between the right end and the stride end

  1238.     for (i = 0; i < c->vChrBufSize; i++)

  1239.         if(desc_dst->comp[0].depth_minus1 == 15){

  1240.             av_assert0(c->dstBpc > 14);

  1241.             for(j=0; j<dst_stride/2+1; j++)

  1242.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1243.         } else

  1244.             for(j=0; j<dst_stride+1; j++)

  1245.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1246. 

  1247.     av_assert0(c->chrDstH <= dstH);

  1248. 

  1249.     if (flags & SWS_PRINT_INFO) {

  1250.         if (flags & SWS_FAST_BILINEAR)

  1251.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1252.         else if (flags & SWS_BILINEAR)

  1253.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1254.         else if (flags & SWS_BICUBIC)

  1255.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1256.         else if (flags & SWS_X)

  1257.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1258.         else if (flags & SWS_POINT)

  1259.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1260.         else if (flags & SWS_AREA)

  1261.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1262.         else if (flags & SWS_BICUBLIN)

  1263.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1264.         else if (flags & SWS_GAUSS)

  1265.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1266.         else if (flags & SWS_SINC)

  1267.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1268.         else if (flags & SWS_LANCZOS)

  1269.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1270.         else if (flags & SWS_SPLINE)

  1271.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1272.         else

  1273.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1274. 

  1275.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1276.                av_get_pix_fmt_name(srcFormat),

  1277. #ifdef DITHER1XBPP

  1278.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1279.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1280.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1281.                                                              "dithered " : "",

  1282. #else

  1283.                "",

  1284. #endif

  1285.                av_get_pix_fmt_name(dstFormat));

  1286. 

  1287.         if (INLINE_MMXEXT(cpu_flags))

  1288.             av_log(c, AV_LOG_INFO, "using MMX2\n");

  1289.         else if (INLINE_AMD3DNOW(cpu_flags))

  1290.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1291.         else if (INLINE_MMX(cpu_flags))

  1292.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1293.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1294.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1295.         else

  1296.             av_log(c, AV_LOG_INFO, "using C\n");

  1297. 

  1298.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1299.         av_log(c, AV_LOG_DEBUG,

  1300.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1301.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1302.         av_log(c, AV_LOG_DEBUG,

  1303.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1304.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1305.                c->chrXInc, c->chrYInc);

  1306.     }

  1307. 

  1308.     c->swScale = ff_getSwsFunc(c);

  1309.     return 0;

  1310. fail: // FIXME replace things by appropriate error codes

  1311.     return -1;

  1312. }

  1313. 

  1314. #if FF_API_SWS_GETCONTEXT

  1315. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1316.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1317.                            int flags, SwsFilter *srcFilter,

  1318.                            SwsFilter *dstFilter, const double *param)

  1319. {

  1320.     SwsContext *c;

  1321. 

  1322.     if (!(c = sws_alloc_context()))

  1323.         return NULL;

  1324. 

  1325.     c->flags     = flags;

  1326.     c->srcW      = srcW;

  1327.     c->srcH      = srcH;

  1328.     c->dstW      = dstW;

  1329.     c->dstH      = dstH;

  1330.     c->srcRange  = handle_jpeg(&srcFormat);

  1331.     c->dstRange  = handle_jpeg(&dstFormat);

  1332.     c->src0Alpha = handle_0alpha(&srcFormat);

  1333.     c->dst0Alpha = handle_0alpha(&dstFormat);

  1334.     c->srcFormat = srcFormat;

  1335.     c->dstFormat = dstFormat;

  1336. 

  1337.     if (param) {

  1338.         c->param[0] = param[0];

  1339.         c->param[1] = param[1];

  1340.     }

  1341.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1342.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1343.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1344. 

  1345.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1346.         sws_freeContext(c);

  1347.         return NULL;

  1348.     }

  1349. 

  1350.     return c;

  1351. }

  1352. #endif

  1353. 

  1354. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1355.                                 float lumaSharpen, float chromaSharpen,

  1356.                                 float chromaHShift, float chromaVShift,

  1357.                                 int verbose)

  1358. {

  1359.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1360.     if (!filter)

  1361.         return NULL;

  1362. 

  1363.     if (lumaGBlur != 0.0) {

  1364.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1365.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1366.     } else {

  1367.         filter->lumH = sws_getIdentityVec();

  1368.         filter->lumV = sws_getIdentityVec();

  1369.     }

  1370. 

  1371.     if (chromaGBlur != 0.0) {

  1372.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1373.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1374.     } else {

  1375.         filter->chrH = sws_getIdentityVec();

  1376.         filter->chrV = sws_getIdentityVec();

  1377.     }

  1378. 

  1379.     if (chromaSharpen != 0.0) {

  1380.         SwsVector *id = sws_getIdentityVec();

  1381.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1382.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1383.         sws_addVec(filter->chrH, id);

  1384.         sws_addVec(filter->chrV, id);

  1385.         sws_freeVec(id);

  1386.     }

  1387. 

  1388.     if (lumaSharpen != 0.0) {

  1389.         SwsVector *id = sws_getIdentityVec();

  1390.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1391.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1392.         sws_addVec(filter->lumH, id);

  1393.         sws_addVec(filter->lumV, id);

  1394.         sws_freeVec(id);

  1395.     }

  1396. 

  1397.     if (chromaHShift != 0.0)

  1398.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1399. 

  1400.     if (chromaVShift != 0.0)

  1401.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1402. 

  1403.     sws_normalizeVec(filter->chrH, 1.0);

  1404.     sws_normalizeVec(filter->chrV, 1.0);

  1405.     sws_normalizeVec(filter->lumH, 1.0);

  1406.     sws_normalizeVec(filter->lumV, 1.0);

  1407. 

  1408.     if (verbose)

  1409.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1410.     if (verbose)

  1411.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1412. 

  1413.     return filter;

  1414. }

  1415. 

  1416. SwsVector *sws_allocVec(int length)

  1417. {

  1418.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1419.     if (!vec)

  1420.         return NULL;

  1421.     vec->length = length;

  1422.     vec->coeff  = av_malloc(sizeof(double) * length);

  1423.     if (!vec->coeff)

  1424.         av_freep(&vec);

  1425.     return vec;

  1426. }

  1427. 

  1428. SwsVector *sws_getGaussianVec(double variance, double quality)

  1429. {

  1430.     const int length = (int)(variance * quality + 0.5) | 1;

  1431.     int i;

  1432.     double middle  = (length - 1) * 0.5;

  1433.     SwsVector *vec = sws_allocVec(length);

  1434. 

  1435.     if (!vec)

  1436.         return NULL;

  1437. 

  1438.     for (i = 0; i < length; i++) {

  1439.         double dist = i - middle;

  1440.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1441.                         sqrt(2 * variance * M_PI);

  1442.     }

  1443. 

  1444.     sws_normalizeVec(vec, 1.0);

  1445. 

  1446.     return vec;

  1447. }

  1448. 

  1449. SwsVector *sws_getConstVec(double c, int length)

  1450. {

  1451.     int i;

  1452.     SwsVector *vec = sws_allocVec(length);

  1453. 

  1454.     if (!vec)

  1455.         return NULL;

  1456. 

  1457.     for (i = 0; i < length; i++)

  1458.         vec->coeff[i] = c;

  1459. 

  1460.     return vec;

  1461. }

  1462. 

  1463. SwsVector *sws_getIdentityVec(void)

  1464. {

  1465.     return sws_getConstVec(1.0, 1);

  1466. }

  1467. 

  1468. static double sws_dcVec(SwsVector *a)

  1469. {

  1470.     int i;

  1471.     double sum = 0;

  1472. 

  1473.     for (i = 0; i < a->length; i++)

  1474.         sum += a->coeff[i];

  1475. 

  1476.     return sum;

  1477. }

  1478. 

  1479. void sws_scaleVec(SwsVector *a, double scalar)

  1480. {

  1481.     int i;

  1482. 

  1483.     for (i = 0; i < a->length; i++)

  1484.         a->coeff[i] *= scalar;

  1485. }

  1486. 

  1487. void sws_normalizeVec(SwsVector *a, double height)

  1488. {

  1489.     sws_scaleVec(a, height / sws_dcVec(a));

  1490. }

  1491. 

  1492. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1493. {

  1494.     int length = a->length + b->length - 1;

  1495.     int i, j;

  1496.     SwsVector *vec = sws_getConstVec(0.0, length);

  1497. 

  1498.     if (!vec)

  1499.         return NULL;

  1500. 

  1501.     for (i = 0; i < a->length; i++) {

  1502.         for (j = 0; j < b->length; j++) {

  1503.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1504.         }

  1505.     }

  1506. 

  1507.     return vec;

  1508. }

  1509. 

  1510. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1511. {

  1512.     int length = FFMAX(a->length, b->length);

  1513.     int i;

  1514.     SwsVector *vec = sws_getConstVec(0.0, length);

  1515. 

  1516.     if (!vec)

  1517.         return NULL;

  1518. 

  1519.     for (i = 0; i < a->length; i++)

  1520.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1521.     for (i = 0; i < b->length; i++)

  1522.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1523. 

  1524.     return vec;

  1525. }

  1526. 

  1527. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1528. {

  1529.     int length = FFMAX(a->length, b->length);

  1530.     int i;

  1531.     SwsVector *vec = sws_getConstVec(0.0, length);

  1532. 

  1533.     if (!vec)

  1534.         return NULL;

  1535. 

  1536.     for (i = 0; i < a->length; i++)

  1537.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1538.     for (i = 0; i < b->length; i++)

  1539.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1540. 

  1541.     return vec;

  1542. }

  1543. 

  1544. /* shift left / or right if "shift" is negative */

  1545. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1546. {

  1547.     int length = a->length + FFABS(shift) * 2;

  1548.     int i;

  1549.     SwsVector *vec = sws_getConstVec(0.0, length);

  1550. 

  1551.     if (!vec)

  1552.         return NULL;

  1553. 

  1554.     for (i = 0; i < a->length; i++) {

  1555.         vec->coeff[i + (length    - 1) / 2 -

  1556.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1557.     }

  1558. 

  1559.     return vec;

  1560. }

  1561. 

  1562. void sws_shiftVec(SwsVector *a, int shift)

  1563. {

  1564.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1565.     av_free(a->coeff);

  1566.     a->coeff  = shifted->coeff;

  1567.     a->length = shifted->length;

  1568.     av_free(shifted);

  1569. }

  1570. 

  1571. void sws_addVec(SwsVector *a, SwsVector *b)

  1572. {

  1573.     SwsVector *sum = sws_sumVec(a, b);

  1574.     av_free(a->coeff);

  1575.     a->coeff  = sum->coeff;

  1576.     a->length = sum->length;

  1577.     av_free(sum);

  1578. }

  1579. 

  1580. void sws_subVec(SwsVector *a, SwsVector *b)

  1581. {

  1582.     SwsVector *diff = sws_diffVec(a, b);

  1583.     av_free(a->coeff);

  1584.     a->coeff  = diff->coeff;

  1585.     a->length = diff->length;

  1586.     av_free(diff);

  1587. }

  1588. 

  1589. void sws_convVec(SwsVector *a, SwsVector *b)

  1590. {

  1591.     SwsVector *conv = sws_getConvVec(a, b);

  1592.     av_free(a->coeff);

  1593.     a->coeff  = conv->coeff;

  1594.     a->length = conv->length;

  1595.     av_free(conv);

  1596. }

  1597. 

  1598. SwsVector *sws_cloneVec(SwsVector *a)

  1599. {

  1600.     int i;

  1601.     SwsVector *vec = sws_allocVec(a->length);

  1602. 

  1603.     if (!vec)

  1604.         return NULL;

  1605. 

  1606.     for (i = 0; i < a->length; i++)

  1607.         vec->coeff[i] = a->coeff[i];

  1608. 

  1609.     return vec;

  1610. }

  1611. 

  1612. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1613. {

  1614.     int i;

  1615.     double max = 0;

  1616.     double min = 0;

  1617.     double range;

  1618. 

  1619.     for (i = 0; i < a->length; i++)

  1620.         if (a->coeff[i] > max)

  1621.             max = a->coeff[i];

  1622. 

  1623.     for (i = 0; i < a->length; i++)

  1624.         if (a->coeff[i] < min)

  1625.             min = a->coeff[i];

  1626. 

  1627.     range = max - min;

  1628. 

  1629.     for (i = 0; i < a->length; i++) {

  1630.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1631.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1632.         for (; x > 0; x--)

  1633.             av_log(log_ctx, log_level, " ");

  1634.         av_log(log_ctx, log_level, "|\n");

  1635.     }

  1636. }

  1637. 

  1638. void sws_freeVec(SwsVector *a)

  1639. {

  1640.     if (!a)

  1641.         return;

  1642.     av_freep(&a->coeff);

  1643.     a->length = 0;

  1644.     av_free(a);

  1645. }

  1646. 

  1647. void sws_freeFilter(SwsFilter *filter)

  1648. {

  1649.     if (!filter)

  1650.         return;

  1651. 

  1652.     if (filter->lumH)

  1653.         sws_freeVec(filter->lumH);

  1654.     if (filter->lumV)

  1655.         sws_freeVec(filter->lumV);

  1656.     if (filter->chrH)

  1657.         sws_freeVec(filter->chrH);

  1658.     if (filter->chrV)

  1659.         sws_freeVec(filter->chrV);

  1660.     av_free(filter);

  1661. }

  1662. 

  1663. void sws_freeContext(SwsContext *c)

  1664. {

  1665.     int i;

  1666.     if (!c)

  1667.         return;

  1668. 

  1669.     if (c->lumPixBuf) {

  1670.         for (i = 0; i < c->vLumBufSize; i++)

  1671.             av_freep(&c->lumPixBuf[i]);

  1672.         av_freep(&c->lumPixBuf);

  1673.     }

  1674. 

  1675.     if (c->chrUPixBuf) {

  1676.         for (i = 0; i < c->vChrBufSize; i++)

  1677.             av_freep(&c->chrUPixBuf[i]);

  1678.         av_freep(&c->chrUPixBuf);

  1679.         av_freep(&c->chrVPixBuf);

  1680.     }

  1681. 

  1682.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1683.         for (i = 0; i < c->vLumBufSize; i++)

  1684.             av_freep(&c->alpPixBuf[i]);

  1685.         av_freep(&c->alpPixBuf);

  1686.     }

  1687. 

  1688.     av_freep(&c->vLumFilter);

  1689.     av_freep(&c->vChrFilter);

  1690.     av_freep(&c->hLumFilter);

  1691.     av_freep(&c->hChrFilter);

  1692. #if HAVE_ALTIVEC

  1693.     av_freep(&c->vYCoeffsBank);

  1694.     av_freep(&c->vCCoeffsBank);

  1695. #endif

  1696. 

  1697.     av_freep(&c->vLumFilterPos);

  1698.     av_freep(&c->vChrFilterPos);

  1699.     av_freep(&c->hLumFilterPos);

  1700.     av_freep(&c->hChrFilterPos);

  1701. 

  1702. #if HAVE_MMX_INLINE

  1703. #if USE_MMAP

  1704.     if (c->lumMmx2FilterCode)

  1705.         munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1706.     if (c->chrMmx2FilterCode)

  1707.         munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1708. #elif HAVE_VIRTUALALLOC

  1709.     if (c->lumMmx2FilterCode)

  1710.         VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1711.     if (c->chrMmx2FilterCode)

  1712.         VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1713. #else

  1714.     av_free(c->lumMmx2FilterCode);

  1715.     av_free(c->chrMmx2FilterCode);

  1716. #endif

  1717.     c->lumMmx2FilterCode = NULL;

  1718.     c->chrMmx2FilterCode = NULL;

  1719. #endif /* HAVE_MMX_INLINE */

  1720. 

  1721.     av_freep(&c->yuvTable);

  1722.     av_freep(&c->formatConvBuffer);

  1723. 

  1724.     av_free(c);

  1725. }

  1726. 

  1727. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1728.                                         int srcH, enum AVPixelFormat srcFormat,

  1729.                                         int dstW, int dstH,

  1730.                                         enum AVPixelFormat dstFormat, int flags,

  1731.                                         SwsFilter *srcFilter,

  1732.                                         SwsFilter *dstFilter,

  1733.                                         const double *param)

  1734. {

  1735.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1736.                                              SWS_PARAM_DEFAULT };

  1737. 

  1738.     if (!param)

  1739.         param = default_param;

  1740. 

  1741.     if (context &&

  1742.         (context->srcW      != srcW      ||

  1743.          context->srcH      != srcH      ||

  1744.          context->srcFormat != srcFormat ||

  1745.          context->dstW      != dstW      ||

  1746.          context->dstH      != dstH      ||

  1747.          context->dstFormat != dstFormat ||

  1748.          context->flags     != flags     ||

  1749.          context->param[0]  != param[0]  ||

  1750.          context->param[1]  != param[1])) {

  1751.         sws_freeContext(context);

  1752.         context = NULL;

  1753.     }

  1754. 

  1755.     if (!context) {

  1756.         if (!(context = sws_alloc_context()))

  1757.             return NULL;

  1758.         context->srcW      = srcW;

  1759.         context->srcH      = srcH;

  1760.         context->srcRange  = handle_jpeg(&srcFormat);

  1761.         context->src0Alpha = handle_0alpha(&srcFormat);

  1762.         context->srcFormat = srcFormat;

  1763.         context->dstW      = dstW;

  1764.         context->dstH      = dstH;

  1765.         context->dstRange  = handle_jpeg(&dstFormat);

  1766.         context->dst0Alpha = handle_0alpha(&dstFormat);

  1767.         context->dstFormat = dstFormat;

  1768.         context->flags     = flags;

  1769.         context->param[0]  = param[0];

  1770.         context->param[1]  = param[1];

  1771.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1772.                                  context->srcRange,

  1773.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1774.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1775.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1776.             sws_freeContext(context);

  1777.             return NULL;

  1778.         }

  1779.     }

  1780.     return context;

  1781. }